Consider the expression:
A = (-3.0*x**2*(x**2 + y**2 + z**2)**(-2.5) - 3.0*y**2*(x**2 + y**2 +
z**2)**(-2.5) - 3.0*z**2*(x**2 + y**2 + z**2)**(-2.5) + 3*(x**2 + y**2 +
z**2)**(-1.5))
It is zero, but sympy cannot simplify it. Now consider
((x**2 + y**2 + z**2)**(2.5))*A = (-3.0*x**2 - 3.0*y**2 - 3.0*z**2 +
3*(x**2 + y**2 + z**2)**1.0)
which is again zero but sympy cannot simplify (x**2 + y**2 + z**2)**1.0
to (x**2 + y**2 + z**2)
Is there a good general strategy for simplifying sums of radicals which
frequently occur in vector analysis.
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